Revox A 77

Data

General

• Manufacturer: Revox
• Model: A 77 Mk I MK II, MK III and Mk IV
• Years of manufacture: 1967-1981
• Manufactured in: Germany / Switzerland
• Colour: grey, silver, housing walnut
• Remote control: Cable remote control 5 m or 10 m (accessories)
• Power consumption: 70 W / with power amplifiers max. 100 W
• Dimensions, horizontal): 413 mm × 359 mm × 215 mm (W × H × D)
• Weight: approx. 15 kg
• Original price approx.: 1700 DM (list price)

Connections

• Number of outputs: 3
  • 2 × output (Cinch): 2.5 V / Ri 600 Ω
  • 1 × Radio (DIN): 1.2 V / Ri 2.5 kΩ
  • 1 × Phones (jack 6.3 mm): 200-600 Ω

• Number of inputs: 3
  • 2 × MIC (jack 6.3 mm / Cinch) Low: 0.15 mV / 50-600 kΩ / High: 2.5 mV / up to 100 kΩ
  • 2 × Aux (Cinch): 35 mV at 1 MΩ
  • 1 × Radio (DIN): 2.5 mV at 33 kΩ

Technical Data

• Max. Coil diameter: 26.5 cm (10.5")
• Drive: 3 external rotor AC motors (direct drive)
  • Tone motor controlled via highly stable oscillator and tachogenerator
  • 2 asynchronous winding motors
• Heads: 3
• Tracks: 2 or 4, depending on version
• Tape speeds: 9.5 and 19 or 19 and 38 cm/s, depending on the version, ±0.2
• Slip: <0.2 %
• Synchronization fluctuations:
• Pitch variations:
  • at 38 cm/s <±0.06 %
  • at 19 cm/s <±0.08 %
  • at 9.5 cm/s <±0.1 %

• Overall frequency response:
  • at 38 cm/s : 30-22,000 Hz +2/-3 dB and 50-18,000 Hz ±1.5 dB, respectively.

at 19 cm/s : 30-20,000 Hz +2/-3 dB or 50-15,000 Hz ±1.5 dB

• • at 9.5 cm/s: 30-16,000 Hz +2/-3 dB or 50-10,000 Hz ±1.5 dB

Signal-to-noise ratio: (over band, CCITT, curve C):

• • at 38 cm/s >61 dB
  • at 19 cm/s >61 dB
  • at 9.5 cm/s >58 dB
• External voltage spacing: n.a.
• Distortion: <2 % (0 VU, 19 and 38 cm/s), <3 % (0 VU, 9.5 cm/s),
• Equalization: NAB (record + playback) or IEC (playback)
• Crosstalk attenuation: Mono: >60 dB, Stereo: >45 dB (1 kHz)
• Erasure attenuation: ≥80 dB
• Premagnetization and erasure frequency: 120 kHz

Special Features

• Additional plug-in power amplifier 2 × 8 watts at 8 Ω; (accessories).
• Versions with wooden cabinet, case and as built-in chassis.

Versions with Dolby-B-NRS , ORF (studio version HighSpeed , symm. In/Out)

Remarks

• Other models of the same series:
• Revox A 700
• Successor Revox B 77

• Tuner:
• Revox A 76

• Amplifier:
• Revox A 78

Pictures

• Extract from brochure: Revox A 77

• Extract from brochure: Revox A 76, A 77, A 78

Test reports

• A77 Dolby, HiFi-Stereophonie 1983-05 (Arndt Klingelnberg)
• A77 analogue reel-to-reel tape recorder compared to digital recording PCM, HiFi-Stereophonie 1982-12ff (Arndt Klingelnberg)

Links

• (Illustrated) Information about the A77 at the Tape Museum
• Revox A77 service manual
• tape machines on Revox website